Protractor



H. H. l- HSTAND July 27, 1926,. 1 1,594,097

PROTRACTOR I Filed April 10, 1924 2 Sheets-Sheet 1 H. H. Hisincl attic-mug! July 27 1926. 1,594,097

H. H. HISTAND PROTRACTOR Filed April 10, 1924 2 Shetsj-Sheet 2 H. Hisiand i Patented li 7, 9 264 3 arms or blades which may be setat any suit V HARRY H.'HISTAND,0F DoYLEsTown; PENNSYLVANIA.

:IPBOTRACTORP j, Application filed apill 10,.1924.seria1 No, 705,584.

I My inventionrelates to protractors adapt .ed to be used 'on a drawing boardin place of triangles. Theprotracto'rconsists of two able angle with relation' to "each other: from zero to ninety degrees and carries. three different scales for; this T purpose. Beside; the ordinary scale'reading up to ninety degrees,

a it carries a second scale divided-into eighths hr of forty-five degrees. Thisfsec'ond scale is used for laying out roof pitches and fit v i "view of Figure 1; v v 3 shows the protractor set at right evident that pitches such as one toj eight,

two to eight and so" on maybe laid out by 'setting the blades from .this scale. "O n the laid out. bythenseof said scale.

I ers' and'draftsmen and is intended to'replace, altogether theiordinary triaii gles'i. When the reverse side of the protractor is, furnished a third scale which is divided into twelfths so that a pitch 'i The. blades are amber blades, that i erably transparentandfire intended to 'be used 7 in connection WIth a T-square or}- straight edge andare reversible so that the outer edge of either one of the blades may be laid fagainst the T-square'. while a [line is drawn along the edge of the other blade; Theprotractorwill befound very useful f v I IQPYBS 'Q e upper blade of theprotractor 'in the workpf architects, engineers, buildcclges of thefbla'des are :Stf atSiXty degrees withrelation'to each o'ther,ithe instrument may be used for drawing; equilateral trian gle'sjof 'practicallyany size and-without the use -of any other instrument. Ordinarily,

the blades contact along their entire surfaces with the paperfori tracing cloth on which the work" is "beingfd one and in order to facilitate lettering, an-adapter is provided.

to be attachedto. one of the edges'so that the blade carrying the adapter will be raised from the" surface of the paper or tracing cloth and'preventjthe smearing of ink when theprotra-ctor is passing' along a straight I securing the blades in adjusted position.

This means that the protractor has'always ready been stated, asfeither oneof the blades can belaid against'the 'T-square or even tithe points ofth'e blades placed againstthe same-which is particularly the case when let- .inches to a root may be tering isto be done the two bladesthen .stand in .the same angular relation with 1 the base line or T-square;

, In, the] accompanying" drawings, one .em-v

bodiment of Figure 4 angles;

Figures 5,6 and? indicatef other angular settings of the instrument;

Figures .8 and. 9 are mgmetmr hn' t v ewsjof the hinge ends of thetwo blades; s, pref is a sideelevationl of Figure 1";f

the invention is illustrated, i

Q Figure 1v is a top. plan view. of the, pro-"' 1 j it'oldedfand with'fthe adapter. posi-. Y

Figure 10 is a plan View ofone; of'wthe 'iein'fo'rcing' plates, with index points a.

the index points :and

tiontaken a1on ;1 li ie In the drawlngs, reference numeral 115 as seen in Figure l and reference numeral :l6'represents the lower blade thereof. "The at a forty-five jdegree angle, as seen at 17 Figure ll isa siniila'r view of the other. :of the reinforcing" plates, with .scales for" Figure'12 is an'enlarged sec 1 12'.12,,0f Figureel'.

and 18'. :The center 28,- Figure of thef hinge iss'ituated-at the intersection of the I continuation of the inner edge 19 with. the cont nuation of the" inclined edge -33Tof the blade :15.

blade 15 which'fits snuglyflin a' concave recess -2l 1n ,the blade 16 so that the circular 'edges'of the projection 20 and the recess 21 always contact'in whatevenposition the blades stand to each other;

v c I Reference numeral 22, Figure 11, indicates The protr'actor is provided with reinforc ing hinge lates-and a clamping'screw for reinforcing hinge plate preferably stamped out of sheet metal.- This is secured the'flike' engaging in suitable apertures 23. The hinge plate has a straight edge 24 coin aiding with Itheinner edge 19 of the b1ade16 andanother edge 25 coinciding with the in- Concentric. with this center] is provided a circular projection. 20 on the" .100 I on the lower blade 16-by meanslof screws or clined edge'18 of the same blade." The plate has a circular projection 26 having'it's edge concentrict'o a center 27 situated atthe in tersection of the continuations of the edges 24: and 25 and when assembled the center 27 coincides with the centers 28 andv29 of the blades and 16. From the edge 24 a degree scale 3O ranging from zero toninety degrees is laid out along the circular edge of the hinge plate 22; and; a second scale 31 marked in eighths of a forty-five degree angle is laid out along the same edge on 'the;

opposite side of the projection 26. On the reverse side of the same projection 26 is laidout the third scale 82 along the circular edge con inencing'at the torty iive degree edge 33 of tliblade 1 5 when closed, This scale has twelve divisions so spaced thatby adjust inent oi vthe'blade 16 to bring its edge 18 into'i'egistration therewith, arise, in inches, per foot may be determined or drawn.

The plate 22 has araised central portion 56 circular in contour. In the space between this; raised portion 56 the circular pro.- jection of the blade 15 is inserted a stud 34', the fo otportion' 57 of which is securedwhatever position they are adjusted.

On the upper blade leis secured an in,- deX plat-e n eansof screws 88. This plate is to cgincid'e with the circular edge 26 ofthe hinge p1at622 and its straight edge 39 coincides 'with the inner: g Y th a d blad while. h st-raight vedge COincidQS. With the forty fiv eg ef des 0 h same. blad I11- continuation or these edges are formed, in deX points e0 and 4:1, reepectively, which reach part-way over thescales 3O an dfil on the hinge plate 22. r

In Figures 1, 2 and 4; is shown adapter 42 which has two arins $23 which are bent so as to grip both top and bottom s ides of one of the blades. On the under side of the adapter are furnished knobbed tect- 4- 4- to perinit easy sliding of the adapter on the tracing cloth or paper upon which work is being done. ()n the u'ppQl. side of the p e s ed ai d porti n 5 with a central recess l6? to facilitate the manipulation of the adapter and to'provide hole for the p at rs fingeh I h' g re o 7 are n i ted a few of P t ns n hich the pr m t r an b used and reference numeral e8 represents a base line or the edge of a T-square against-V which difiterent angles are intended to be drawn. When the protractor is fully open, as seen in Flgure e, the two blades are set at right angles to each otherso that the line drawn against the edge 49 will'be perpendicular to the base line 4 8. I ,7

In Figure 5, the blades are set at forty-five degrees to each other in accordance with the degree scale on the protractor and a line drawn along the edge 50 will accordingly run at forty-five degrees against the base line 48. It is evident that by reversingthe protractor placingthe edge 50 against the base line, a line may be drawn along the outer edge of the other blade in opposite direction to he rst l n i at fli ?S 9E 5 951 against the. base line 48. V In gu e 6 is shown. a nosition. fjthe P19:

tractor suitable for lettering and-thefblad ay en he djus ed. to any esired; i

- nation of the letters the outer edges oii both blades being used for this pnrpQSe fli 5;

evi ent thattheprotractor inayfbe set was its short points, near the hinge; against the;

base line 48 or reversed andfsetfupcn the,

other points at the opposite blades against the baseli e In.tliie,latterz case, and. it adjusted toa sixty degre an between the edges, the, 'protractor used for laying out any'size of egg triangles. I

stead of using the degreeisicalje inad: j s ing the n me: for lay n half a 1- triangles, the blades may be: 11.,

ends or the? ii the single radial'l ine'50 on the reversesi degotv e p at a i een in. Figur fig e t i il the edge 33.

,usethe adapter 42 on oneor both of. theiblades 151 and 16.1 After setting the bladesftothe required angle against each other. furiher using the prot a oi s, "indicated in,

ure 4; with the ou er edge" 0t one blade against the baseline d8. or stood; ot points, of the blades asyshownin Fignre t e pr tractor mayithen be made Sl de Bl e sll fvfaceof the drawing with the} feet er of the adapter contacting'therewitli and the blade raised. abjovethe surtace; of the drawing so that iii/ink is used, let; tering there l the same.

In Figure? is illustrated the, use, eithe- Inlettering a, drawing ibis. advisable.

l h a d nse t eari scale 32 for inclinations or; one two,three,o t

moreinches to thefoot. This setting of the protractonmay be used for laying out, leiit; hand or rlght hand inclinations by sliding, one or theother of the blades. against the.

base line; This figure also represents a setting by the use of the scaleBI for obtaining roof pitches. Having thus described theinyention, What, is claimed as newis: i V I 11;. A protractor comprising a pain of blades having straight edges, one if blades, at one end; having a, recess having'an arcuate wall,, the other blade atithe cor-re;

P H Q- havingi cul r eeten cn,

rotatabl y fittin in the recess, a pivot car fried by the sai extension and concentric to cave edge embracing the said margin of the first mentioned plate and providedfwitha pointer forcoaction' with the'saidscale.

2. A, "protractor comprising a pair of blades having straight edges,-lone of jsaidy blades, at one end thereof, vhaving a recess having'an arcuate wall, the other blade, at the corresponding end, hav ng. a circular ex tension rotatably "fitting in the recess, the" blades at their said ends having their end edges at forty-five degrees to their" straight edges, a platesecured to the first mentioned blade-and having a circular portion extenda ingoven the'recess therein, means pivotally connecting the'circnlar portion of the plate T V andjthe' extension of the second mentioned 1 blade, concentrically, the said extended por:

gin concentric to the pivot'and bearing a protractor scale, the said extended portion of the said plate upon its under side having a scale for registration with the said end edge of the first mentionedblade', and a platev secured to thesecond-mentioned blade. and

having an arcuate'concave edge embracing" jthesaid marginof the first mentioned plate t andprovided w th, a pointer for coac'tion with the first mentioned scale thereoi'nf ,tion. ofthe said plate having'an arc iate mar.-

lntestimonylwhereot' I a-ifix my signature.

HARRY 'HISTA'ND. Li's 

